This graph gives the theoretical pixel size at nadir for Eagle and Hawk. Pixel size will be larger at the edges of the swath, so at least to start with you should use a slightly higher value than that given by this graph. Also note that this is primarily across-track pixel size, along-track will vary with the speed of the aircraft (but we suggest you use square pixels based on the across-track pixel size).

6

7

[[Image(pixelsize.png)]]

10

8

11

9

Note this is the altitude over the ground, not the altitude from GPS (which is over the spheroid and takes no account of local terrain variation).